How to specify a NULL Bus Object to an S-Function input?

2015 9 4
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I have created an S-Function that takes a pointer to a bus object for one of its parameters. The parameter is optional. If the pointer address is NULL, then the function changes it's behavior.
I want to create a NULL bus object argument in Simulink to drive the input. I have tried many different things, but I either get build errors or Simulink makes a structure anyway with an address that is not NULL.
How do I specify a NULL input to an S-Function?

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